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Shrinkage occurs when a casting contracts as it cools, resulting in voids within the material. Porosity refers to trapped gas pockets inside a casting, often due to improper venting or gas release during solidification. To determine if cavities are from porosity or shrinkage, porosity tends to be more evenly distributed throughout the casting, while shrinkage cavities are typically found in specific areas where the material has solidified last.

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How can you tell whether cavities in a casting are due to porosity or to shrinkage?

Porosity is a defect, which results from air entrapment in the molten metal due to turbulent flow causing air bubbles. Usually, this defect is characterized by smooth and spherical pores, but if rough and angular it is most likely as a result of shrinkage dendrites. The mechanical properties associated with shrinkage is the thermal expansion of the molten metal when it solidifies and cools to room temperature, if the riser isn't properly designed to accommodate shrinkage, there would be dimensional changes and are usually in form of cracks.


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Porosity refers to the amount of empty space in a material. A higher porosity means there are more empty spaces, allowing for better infiltration of water. In contrast, lower porosity restricts the movement of water into the ground.


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The mold design control  ?

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Whats the best way to determine whether a motor really is a 383 or just another 350?

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